Stave silo



April 6, 1937, w. H. SMITH STAVE SILO Filed Sept. 12, 1935 mm m m m Em IH. a 1 w Patented Apr. 6, 1937 UNITED STATES ATENT OFFICE Claims.

This invention relates to improvements in concrete stave silos and silostaves.

The stave silo of this invention is an improvement of thecombinationillustrated in Patent 51 No. 1,250,685, issued December 18, 1917, toHiram A. Smith.

The objects of the invention are: First, to provide a silo with avitreous or tile lining with effectively sealed joints thateflectively'prevent the juices of the ensilage from attacking theconcrete.

Second, to provide an improved veneered or faced tile for the purpose.

Further objects and objects pertaining to details and economies willappear from the description to follow. I describe one embodiment of thefeatures of my invention in the following specification and illustratethe same in the drawing, in which:

Fig. 1 is an elevation view of the top part of a silo, the lower partbeing broken away, made of my improved staves.

Fig. 2 is an enlarged detail sectional view on line 22 of Fig. 1 throughone of the joints between the staves and showing the manner of retainingit by the hoop or rod.

Fig. 3 is an enlarged perspective view of one of my improved facedconcrete staves which is here shown with the joint formation at the endsas well as at the sides.

The parts will be identified by their numerals of reference which arethe same in all the views.

I is the tile body exposed to view in Fig. 1 and in cross section inFig. 2, the same being of concrete with the fines developed on the innerface of the stave. 2 is the facing or Veneer lining of the stave, whichI preferably make of vitrified clay tile, the same having dovetailedinterlocking ribs 3 on its back to insure engagement and location withthe concrete body of the stave. The stave bodies in the main are of theconstruction described in Hiram Smiths Patent 1,325,050 of December 16,1919, with my added veneer facing.

The body of the stave is made with a tongue and groove joint 4 with arabbet recess 5 between the inner faces of the concrete and with adovetail groove 6 between the facings 2 as seen in Fig. 2. I there showthe surfaces somewhat oblique, but if such surfaces are left straight atright angles to the inner face, they will flare slightly when placed inthe circular wall of a silo. I exaggerate this in the drawing.

On the outer face, I form a depression I at each edge, which may be leftopen for the ornamental efl'ect. This insures fit and appearance.

I preferably fill the depression with contrasting 1 cementitiousmaterial, either clear cement or plastic composition of asphalt.

The block is formed in molds which are like the molds of the aforesaidpatent. These molds are made with added ribs for forming the rabbetgrooves 5. The mold is then placed on the jogger or vibrating machinesuch as that illustrated in the patent to Hiram Smith 1,595,255 ofAugust. 10,1926.

The mold is then vibrated, causing the coarser. aggregates todescend'to. the vbottomor outside of the stave body and the fines toaccumulate in a perfectly level manner in the top of the mold. I thenplace the vitreous tile 2 with the interlocking dovetail ribs downwardcentrally ofthe mold and in spaced relation thereto and jog the sameinto the surface of the mold. This forms a shoulder of concrete aroundthe tile facing, which, when the same is assembled in the silo, formsthe dovetail groove on space 6, whether the edge be beveled as shown orsquare.

These concrete staves are then cured in the usual way. The fines aredeveloped at the top and insure perfect bonding with the unglazedsurface of the tile within and the effective location of the same issecured by the dovetail ribs 3 referred to. This forms the stave with avitreous facing 2. I have illustrated the different steps or projectionsin the perspective view of Fig. 3. The tongue and groove joint 4, therabbeted groove 5 and the dovetail groove 6, formed at the point wherethe edge of the tile is spaced from the mold, are detailed.

These staves are assembled into a circular wall with a joint, asindicated in Fig. 2. The doors for the silo are provided in any usualmanner. The joint at the rabbets 5 is filled with substantially purecement mixture and. this is covered by a waterproofing mixture,preferably an asphalt plastic material deposited in the groove 5 by theuse of the usual gun for this purpose. The recess 1 at the outside maybe left open and gives a very good finish to the stave body of the silo.I prefer to fill the same with cement or asphalt. The whole is retainedby the tie rod or hoop 10 with the usual tensioning lugs H which enablethe whole silo wall to be put under tension and the joints thusmaintained.

I show the joint form on the ends of the staves. This is ordinarily leftsquare.

I show a vitreous tile lining with dovetail ribs. This is highlydesirable. However, a plain tile or one with other forms of projectionsmay be used.

The method may be used with any kind of facing material, such asporcelain or glass.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A silo, the walls of which are constructed of staves having a bodyportion of concrete with tongue and groove joints at their verticaledges with rabbeted grooves at their inner face edges filled with acement joint material, and recesses at their outer face edges to formgrooves, a vitrefied liner plate for each stave connected thereto by asuitable dovetail and bonded to the inner surface of said stave, suchstave body portion projecting beyond the same to form a dovetail recessbetween the said liner plates, a packing of asphaltic plastic materialbetween the said liner plates, and a hoop for retaining the staves inplace.

2. A silo, the walls of which are constructed of staves having a bodyportion of concrete with tongue and groove joints at their vertical.edges with rabbeted grooves at their inner face edges filled with acement joint material, a vitrefied liner plate for each stave connectedthereto and bonded to the inner surface of said stave, such stave: bodyportion projecting beyond the same to form a dovetail recess between thesaid liner plates, a packing of as'phaltic plastic material between thesaid liner plates, and a hoop for. retaining the staves in place.

3. A silo, the walls of which are constructed of staves having a bodyportion of concrete with joints at their vertical edges with rabbetedgrooves at their inner face edges filled with a cement joint material, avitrefied liner plate for each stave connected thereto and bonded to theinner surface of said stave, such stave body portion projecting beyondthe same to form a dovetail recess between the said liner plates, and apacking of asphaltic plastic material between the said liner plates anda hoop to retain said staves in place.

4. A silo, the walls of which are constructed of staves having a bodyportion of concrete with joints at their vertical edges, a vitrefiedliner plate for each stave connected thereto and bonded to the-innersurface of said stave, such stave body portion projecting beyond thesame to form a dovetail recess between the said liner plates, and apacking of asphaltic plastic material between the said liner plates anda hoop to retain said staves in place.. i.

5. A silo, the walls of which are constructed oi staves having a bodyportion of concrete with joints at their vertical edges, an imperviousliner plate. for each stave connected thereto and bond ed to the innersurface of said stave, such stave body portion projecting beyond the;samev to form a recess between the said liner plates, a packing of acidresisting material between the said liner plates, and a hoop to retainsaid staves in place.

WARREN H, SMITH.

